HL7v2 stands for "Health Level 7: Version 2" - a specification for shuttling clinical data around and between medical institutions. While working on Medtasker with Nimblic, I've written this library for reading the protocol and querying the messages it contains.
I have a blog post on my website if you'd like to hear a bit more of the story.
$ go get fknsrs.biz/p/hl7
3-clause BSD. A copy is included with the source.